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A multi-purpose, hypoid gear lubricant which conforms to the following specifications should be used. MOPAR Hypoid Gear Lubricant conforms to all of these specifications.
- The lubricant should have MIL-L-2105C and API GL 5 quality specifications.
- Lubricant is a thermally stable SAE 80W-90 gear lubricant.
- Lubricant for axles intended for heavy-duty or trailer tow use is SAE 75W-140 SYNTHETIC gear lubricant.
The 186 FBI, with a standard differential, axle lubricant capacity is 1.18 L (2.5 pts.). The 186 FBI, with a Vari-LOK differential, axle lubricant capacity is 1.19 L (2.51 pts.), which includes friction modifier. Vari-LOK equipped vehicles require the addition of 0.07 L (0.15 pts.) of friction modifier.

CAUTION: If axle is submerged in water, lubricant must be replaced immediately to avoid possible premature axle failure.